Name: ISO 14227:2001 — Small craft — Magnetic compasses
SKU: ISO 14227:2001
Price: 25 EUR
Availability: InStock

Overview

ISO 14227:2001 - Small craft - Magnetic compasses - specifies general construction, performance and type-test requirements for liquid magnetic compasses used on small craft with hull length up to 24 m. The standard covers inspectable liquid compasses (direct-reading or reflecting/projecting types), including compasses not supported on gimbals. It explicitly excludes dry-card compasses and compass types based on different principles (for example transmitting compasses).

Key topics and technical requirements

Scope and marking
- Applies to liquid magnetic compasses for small craft (≤ 24 m).
- Required markings: manufacturer name, type/serial number, ISO 14227 reference, and liquid type if not alcohol.
Materials and construction
- Non-magnetic materials for housings; directional-system magnets must have high remanence/coercivity.
- Components must perform at normal reference temperature (+20 °C ± 3 °C).
Compass bowl and gimbals
- Bowl supported by gimbals with perpendicular axes ±1° and coplanarity ±1 mm; external gimbal axis aligned with craft longitudinal direction.
- Liquid must remain clear, bubble-free and not freeze or emulsify in −30 °C to +60 °C.
Directional system and pivot
- Pivot bearing of hard stone; pivot force and magnetic moment requirements defined (see standard for values).
- Pivot must remain free with specified tilt (10° for gimballed, 30° if not).
Card, graduations and visibility
- Minimum card diameter: 100 mm (65 mm for hemispherical); graduations ≤ 5°; readable at 1 m within ±15° of lubber mark.
Performance and accuracy
- Directional error ≤ 1.5°; lubber error ≤ 1.0° (for external gimbal axis); friction error ≤ 1°.
- Swirl error limits: ≤ 3.5° for card

ISO 14227:2001 PDF

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